|
1 /* |
|
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
|
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
|
4 * |
|
5 * This code is free software; you can redistribute it and/or modify it |
|
6 * under the terms of the GNU General Public License version 2 only, as |
|
7 * published by the Free Software Foundation. |
|
8 * |
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT |
|
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
12 * version 2 for more details (a copy is included in the LICENSE file that |
|
13 * accompanied this code). |
|
14 * |
|
15 * You should have received a copy of the GNU General Public License version |
|
16 * 2 along with this work; if not, write to the Free Software Foundation, |
|
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
18 * |
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
20 * or visit www.oracle.com if you need additional information or have any |
|
21 * questions. |
|
22 * |
|
23 */ |
|
24 |
|
25 #include "precompiled.hpp" |
|
26 #include "runtime/mutexLocker.hpp" |
|
27 #include "runtime/safepoint.hpp" |
|
28 #include "runtime/thread.inline.hpp" |
|
29 #include "runtime/threadLocalStorage.hpp" |
|
30 #include "runtime/vmThread.hpp" |
|
31 |
|
32 // Mutexes used in the VM (see comment in mutexLocker.hpp): |
|
33 // |
|
34 // Note that the following pointers are effectively final -- after having been |
|
35 // set at JVM startup-time, they should never be subsequently mutated. |
|
36 // Instead of using pointers to malloc()ed monitors and mutexes we should consider |
|
37 // eliminating the indirection and using instances instead. |
|
38 // Consider using GCC's __read_mostly. |
|
39 |
|
40 Mutex* Patching_lock = NULL; |
|
41 Monitor* SystemDictionary_lock = NULL; |
|
42 Mutex* PackageTable_lock = NULL; |
|
43 Mutex* CompiledIC_lock = NULL; |
|
44 Mutex* InlineCacheBuffer_lock = NULL; |
|
45 Mutex* VMStatistic_lock = NULL; |
|
46 Mutex* JNIGlobalHandle_lock = NULL; |
|
47 Mutex* JNIHandleBlockFreeList_lock = NULL; |
|
48 Mutex* MemberNameTable_lock = NULL; |
|
49 Mutex* JmethodIdCreation_lock = NULL; |
|
50 Mutex* JfieldIdCreation_lock = NULL; |
|
51 Monitor* JNICritical_lock = NULL; |
|
52 Mutex* JvmtiThreadState_lock = NULL; |
|
53 Monitor* JvmtiPendingEvent_lock = NULL; |
|
54 Monitor* Heap_lock = NULL; |
|
55 Mutex* ExpandHeap_lock = NULL; |
|
56 Mutex* AdapterHandlerLibrary_lock = NULL; |
|
57 Mutex* SignatureHandlerLibrary_lock = NULL; |
|
58 Mutex* VtableStubs_lock = NULL; |
|
59 Mutex* SymbolTable_lock = NULL; |
|
60 Mutex* StringTable_lock = NULL; |
|
61 Monitor* StringDedupQueue_lock = NULL; |
|
62 Mutex* StringDedupTable_lock = NULL; |
|
63 Mutex* CodeCache_lock = NULL; |
|
64 Mutex* MethodData_lock = NULL; |
|
65 Mutex* RetData_lock = NULL; |
|
66 Monitor* VMOperationQueue_lock = NULL; |
|
67 Monitor* VMOperationRequest_lock = NULL; |
|
68 Monitor* Safepoint_lock = NULL; |
|
69 Monitor* SerializePage_lock = NULL; |
|
70 Monitor* Threads_lock = NULL; |
|
71 Monitor* CGC_lock = NULL; |
|
72 Mutex* STS_init_lock = NULL; |
|
73 Monitor* SLT_lock = NULL; |
|
74 Monitor* iCMS_lock = NULL; |
|
75 Monitor* FullGCCount_lock = NULL; |
|
76 Monitor* CMark_lock = NULL; |
|
77 Mutex* CMRegionStack_lock = NULL; |
|
78 Mutex* SATB_Q_FL_lock = NULL; |
|
79 Monitor* SATB_Q_CBL_mon = NULL; |
|
80 Mutex* Shared_SATB_Q_lock = NULL; |
|
81 Mutex* DirtyCardQ_FL_lock = NULL; |
|
82 Monitor* DirtyCardQ_CBL_mon = NULL; |
|
83 Mutex* Shared_DirtyCardQ_lock = NULL; |
|
84 Mutex* ParGCRareEvent_lock = NULL; |
|
85 Mutex* EvacFailureStack_lock = NULL; |
|
86 Mutex* DerivedPointerTableGC_lock = NULL; |
|
87 Mutex* Compile_lock = NULL; |
|
88 Monitor* MethodCompileQueue_lock = NULL; |
|
89 Monitor* CompileThread_lock = NULL; |
|
90 Mutex* CompileTaskAlloc_lock = NULL; |
|
91 Mutex* CompileStatistics_lock = NULL; |
|
92 Mutex* MultiArray_lock = NULL; |
|
93 Monitor* Terminator_lock = NULL; |
|
94 Monitor* BeforeExit_lock = NULL; |
|
95 Monitor* Notify_lock = NULL; |
|
96 Monitor* Interrupt_lock = NULL; |
|
97 Monitor* ProfileVM_lock = NULL; |
|
98 Mutex* ProfilePrint_lock = NULL; |
|
99 Mutex* ExceptionCache_lock = NULL; |
|
100 Monitor* ObjAllocPost_lock = NULL; |
|
101 Mutex* OsrList_lock = NULL; |
|
102 #ifndef PRODUCT |
|
103 Mutex* FullGCALot_lock = NULL; |
|
104 #endif |
|
105 |
|
106 Mutex* Debug1_lock = NULL; |
|
107 Mutex* Debug2_lock = NULL; |
|
108 Mutex* Debug3_lock = NULL; |
|
109 |
|
110 Mutex* tty_lock = NULL; |
|
111 |
|
112 Mutex* RawMonitor_lock = NULL; |
|
113 Mutex* PerfDataMemAlloc_lock = NULL; |
|
114 Mutex* PerfDataManager_lock = NULL; |
|
115 Mutex* OopMapCacheAlloc_lock = NULL; |
|
116 |
|
117 Mutex* FreeList_lock = NULL; |
|
118 Monitor* SecondaryFreeList_lock = NULL; |
|
119 Mutex* OldSets_lock = NULL; |
|
120 Monitor* RootRegionScan_lock = NULL; |
|
121 Mutex* MMUTracker_lock = NULL; |
|
122 Mutex* HotCardCache_lock = NULL; |
|
123 |
|
124 Monitor* GCTaskManager_lock = NULL; |
|
125 |
|
126 Mutex* Management_lock = NULL; |
|
127 Monitor* Service_lock = NULL; |
|
128 Monitor* PeriodicTask_lock = NULL; |
|
129 |
|
130 #ifdef INCLUDE_TRACE |
|
131 Mutex* JfrStacktrace_lock = NULL; |
|
132 Monitor* JfrMsg_lock = NULL; |
|
133 Mutex* JfrBuffer_lock = NULL; |
|
134 Mutex* JfrStream_lock = NULL; |
|
135 Mutex* JfrThreadGroups_lock = NULL; |
|
136 #endif |
|
137 |
|
138 #define MAX_NUM_MUTEX 128 |
|
139 static Monitor * _mutex_array[MAX_NUM_MUTEX]; |
|
140 static int _num_mutex; |
|
141 |
|
142 #ifdef ASSERT |
|
143 void assert_locked_or_safepoint(const Monitor * lock) { |
|
144 // check if this thread owns the lock (common case) |
|
145 if (IgnoreLockingAssertions) return; |
|
146 assert(lock != NULL, "Need non-NULL lock"); |
|
147 if (lock->owned_by_self()) return; |
|
148 if (SafepointSynchronize::is_at_safepoint()) return; |
|
149 if (!Universe::is_fully_initialized()) return; |
|
150 // see if invoker of VM operation owns it |
|
151 VM_Operation* op = VMThread::vm_operation(); |
|
152 if (op != NULL && op->calling_thread() == lock->owner()) return; |
|
153 fatal(err_msg("must own lock %s", lock->name())); |
|
154 } |
|
155 |
|
156 // a stronger assertion than the above |
|
157 void assert_lock_strong(const Monitor * lock) { |
|
158 if (IgnoreLockingAssertions) return; |
|
159 assert(lock != NULL, "Need non-NULL lock"); |
|
160 if (lock->owned_by_self()) return; |
|
161 fatal(err_msg("must own lock %s", lock->name())); |
|
162 } |
|
163 #endif |
|
164 |
|
165 #define def(var, type, pri, vm_block) { \ |
|
166 var = new type(Mutex::pri, #var, vm_block); \ |
|
167 assert(_num_mutex < MAX_NUM_MUTEX, \ |
|
168 "increase MAX_NUM_MUTEX"); \ |
|
169 _mutex_array[_num_mutex++] = var; \ |
|
170 } |
|
171 |
|
172 void mutex_init() { |
|
173 def(tty_lock , Mutex , event, true ); // allow to lock in VM |
|
174 |
|
175 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC |
|
176 def(STS_init_lock , Mutex, leaf, true ); |
|
177 if (UseConcMarkSweepGC) { |
|
178 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification |
|
179 } |
|
180 if (UseConcMarkSweepGC || UseG1GC) { |
|
181 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent |
|
182 } |
|
183 if (UseG1GC) { |
|
184 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread |
|
185 def(CMRegionStack_lock , Mutex, leaf, true ); |
|
186 def(SATB_Q_FL_lock , Mutex , special, true ); |
|
187 def(SATB_Q_CBL_mon , Monitor, nonleaf, true ); |
|
188 def(Shared_SATB_Q_lock , Mutex, nonleaf, true ); |
|
189 |
|
190 def(DirtyCardQ_FL_lock , Mutex , special, true ); |
|
191 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true ); |
|
192 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true ); |
|
193 |
|
194 def(FreeList_lock , Mutex, leaf , true ); |
|
195 def(SecondaryFreeList_lock , Monitor, leaf , true ); |
|
196 def(OldSets_lock , Mutex , leaf , true ); |
|
197 def(RootRegionScan_lock , Monitor, leaf , true ); |
|
198 def(MMUTracker_lock , Mutex , leaf , true ); |
|
199 def(HotCardCache_lock , Mutex , special , true ); |
|
200 def(EvacFailureStack_lock , Mutex , nonleaf , true ); |
|
201 |
|
202 def(StringDedupQueue_lock , Monitor, leaf, true ); |
|
203 def(StringDedupTable_lock , Mutex , leaf, true ); |
|
204 } |
|
205 def(ParGCRareEvent_lock , Mutex , leaf , true ); |
|
206 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); |
|
207 def(CodeCache_lock , Mutex , special, true ); |
|
208 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing |
|
209 def(RawMonitor_lock , Mutex, special, true ); |
|
210 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. |
|
211 |
|
212 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. |
|
213 def(ObjAllocPost_lock , Monitor, special, false); |
|
214 def(Service_lock , Monitor, special, true ); // used for service thread operations |
|
215 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. |
|
216 |
|
217 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread |
|
218 def(PackageTable_lock , Mutex , leaf, false); |
|
219 def(InlineCacheBuffer_lock , Mutex , leaf, true ); |
|
220 def(VMStatistic_lock , Mutex , leaf, false); |
|
221 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread |
|
222 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread |
|
223 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); |
|
224 def(SymbolTable_lock , Mutex , leaf+2, true ); |
|
225 def(StringTable_lock , Mutex , leaf, true ); |
|
226 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing |
|
227 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing |
|
228 def(OsrList_lock , Mutex , leaf, true ); |
|
229 def(Debug1_lock , Mutex , leaf, true ); |
|
230 #ifndef PRODUCT |
|
231 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe |
|
232 #endif |
|
233 def(BeforeExit_lock , Monitor, leaf, true ); |
|
234 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data |
|
235 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources |
|
236 |
|
237 // CMS_modUnionTable_lock leaf |
|
238 // CMS_bitMap_lock leaf + 1 |
|
239 // CMS_freeList_lock leaf + 2 |
|
240 |
|
241 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock |
|
242 |
|
243 def(Threads_lock , Monitor, barrier, true ); |
|
244 |
|
245 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these |
|
246 def(VMOperationRequest_lock , Monitor, nonleaf, true ); |
|
247 def(RetData_lock , Mutex , nonleaf, false); |
|
248 def(Terminator_lock , Monitor, nonleaf, true ); |
|
249 def(VtableStubs_lock , Mutex , nonleaf, true ); |
|
250 def(Notify_lock , Monitor, nonleaf, true ); |
|
251 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock |
|
252 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions |
|
253 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); |
|
254 if (UseConcMarkSweepGC) { |
|
255 def(SLT_lock , Monitor, nonleaf, false ); |
|
256 // used in CMS GC for locking PLL lock |
|
257 } |
|
258 def(Heap_lock , Monitor, nonleaf+1, false); |
|
259 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation |
|
260 def(MemberNameTable_lock , Mutex , nonleaf+1, false); // Used to protect MemberNameTable |
|
261 |
|
262 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock |
|
263 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); |
|
264 def(CompileStatistics_lock , Mutex , nonleaf+2, false); |
|
265 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock |
|
266 |
|
267 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController |
|
268 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents |
|
269 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management |
|
270 |
|
271 def(Compile_lock , Mutex , nonleaf+3, true ); |
|
272 def(MethodData_lock , Mutex , nonleaf+3, false); |
|
273 |
|
274 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); |
|
275 def(Debug2_lock , Mutex , nonleaf+4, true ); |
|
276 def(Debug3_lock , Mutex , nonleaf+4, true ); |
|
277 def(ProfileVM_lock , Monitor, special, false); // used for profiling of the VMThread |
|
278 def(CompileThread_lock , Monitor, nonleaf+5, false ); |
|
279 def(PeriodicTask_lock , Monitor, nonleaf+5, true); |
|
280 |
|
281 #ifdef INCLUDE_TRACE |
|
282 def(JfrMsg_lock , Monitor, leaf, true); |
|
283 def(JfrBuffer_lock , Mutex, nonleaf+1, true); |
|
284 def(JfrThreadGroups_lock , Mutex, nonleaf+1, true); |
|
285 def(JfrStream_lock , Mutex, nonleaf+2, true); |
|
286 def(JfrStacktrace_lock , Mutex, special, true ); |
|
287 #endif |
|
288 |
|
289 } |
|
290 |
|
291 GCMutexLocker::GCMutexLocker(Monitor * mutex) { |
|
292 if (SafepointSynchronize::is_at_safepoint()) { |
|
293 _locked = false; |
|
294 } else { |
|
295 _mutex = mutex; |
|
296 _locked = true; |
|
297 _mutex->lock(); |
|
298 } |
|
299 } |
|
300 |
|
301 // Print all mutexes/monitors that are currently owned by a thread; called |
|
302 // by fatal error handler. |
|
303 void print_owned_locks_on_error(outputStream* st) { |
|
304 st->print("VM Mutex/Monitor currently owned by a thread: "); |
|
305 bool none = true; |
|
306 for (int i = 0; i < _num_mutex; i++) { |
|
307 // see if it has an owner |
|
308 if (_mutex_array[i]->owner() != NULL) { |
|
309 if (none) { |
|
310 // print format used by Mutex::print_on_error() |
|
311 st->print_cr(" ([mutex/lock_event])"); |
|
312 none = false; |
|
313 } |
|
314 _mutex_array[i]->print_on_error(st); |
|
315 st->cr(); |
|
316 } |
|
317 } |
|
318 if (none) st->print_cr("None"); |
|
319 } |